Aahh... o.k., now i get your point. You see the Fubuki as a Target!
I never think about that.
So you are right, if you want to torpedo a Fubuki it is better to deactivate the Mod, if anything changed there.
With the Fubuki there is another Problem. She takes Water in High Sea and sink after a while. Didnt know why, they forget to build in some pumps?
The Asashio doesnt have the Problem, i sail over the whole Pacific and it is o.k..
Panama Canal, western Approach